How to Calculate Engagement Rate: Pick the Count and the Base

Engagement rate is a ratio: a count of engagement divided by a base such as the people who saw the post. The Instagram and Meta help pages we read define the counts but do not publish a formula called engagement rate Source [1]Source [2]. So the useful habit is to write down which count and which base you used, every time.

This page covers what Instagram's insights page and Meta's ads metric page define. Other pages in those help centers may say more, and both pages label some metrics as estimated or in development Source [1]Source [2]. The ratios below are our own arithmetic, not a platform formula.

Autonomah prices by the scope of the plan, not a count of pieces Source [3]; an engagement rate, by contrast, depends on the count and the base you choose.

The counts Instagram defines

Instagram's page lists these insights for posts, reels, stories and live videos Source [1]:

• Views: the number of times your content was played or displayed Source [1].
• Viewers: the number of unique accounts that have seen your content on screen at least once Source [1].
• Interactions: the number of actions people take when they engage with your content, such as likes, comments, saves and shares Source [1].
• Accounts engaged: the number of unique accounts that have interacted with your content Source [1].

Two details matter for a ratio. Interactions counts actions, and Accounts engaged counts unique accounts, so by those definitions one person who likes and comments adds two interactions and one account Source [1]. And for posts, stories and Instagram Live, Accounts engaged can be split into followers and non-followers Source [1], so engaged accounts are not all your followers. The page labels Viewers and Accounts engaged as estimated and in-development metrics Source [1].

What "post engagement" means in Meta ads

Meta's ads metric called post engagement is the total number of actions people take involving your ads across Meta technologies, and the page says the metric is in development Source [2]. The actions that may count include post shares, reactions, saves and comments, but also 3-second video plays, photo views, link clicks, profile clicks, profile follows, location clicks, hashtag clicks and poll sticker clicks Source [2]. Post engagement counts only interactions with posts, while page engagement also counts interactions with other content on the Page and profile Source [2].

So the same word covers different counts. Instagram's Interactions lists likes, comments, saves and shares as examples Source [1], and Meta's post engagement for ads includes link clicks and video plays as well Source [2].

Four ratios you can compute

Pick one, name it, and keep it for every post you compare.

1. Accounts engaged divided by Viewers. Both are counts of unique accounts, so the result reads as a share of the people who saw the post who interacted Source [1].
2. Interactions divided by Viewers. Read it as interactions per viewer, because one account can interact more than once Source [1].
3. Interactions divided by Views. Views counts plays or displays, so repeat views by the same account are in the base Source [1].
4. Interactions divided by followers. Our caution: interactions can come from non-followers Source [1], so this is not a share of your followers.

An illustration with made-up numbers: a post with four hundred viewers, forty engaged accounts and sixty interactions has an accounts-engaged-to-viewers ratio of one in ten and fifteen interactions for every hundred viewers.

Autonomah's plans state their volume as one third, two thirds or all of what each network rewards Source [3].

Rules for a rate you can compare

These four rules are ours, not Instagram's or Meta's.

1. Name the count, the base, the period and where you read each number.
2. Use the same base for every post in a comparison.
3. Do not compare your rate with another account's unless you know their base. Instagram's and Meta's definitions are separate, and the ad metric's examples include link clicks and video plays Source [2].
4. Note the date you read the numbers, since both pages describe some metrics as estimated or in development Source [1]Source [2].

How Autonomah does it

Autonomah is an artificial creative and advertising brain that thinks, creates and publishes each brand's advertising Source [3]. It publishes on Instagram, Facebook, TikTok, LinkedIn, YouTube, X, Threads, Pinterest and Google Business, depending on the plan Source [3]. Look at how the plans differ by network.

Frequently asked questions

What is the formula for engagement rate?

The help pages we read give no single formula. Instagram defines Interactions and Accounts engaged, along with Viewers and Views, which can serve as bases Source [1], and Meta defines post engagement for ads as the total number of actions people take involving your ads Source [2]. A rate is one of those counts divided by one of those bases, and you choose which.

Is engagement the same on Instagram and in Meta ads?

Not by these definitions. Meta's post engagement for ads includes actions such as link clicks and 3-second video plays Source [2], and Instagram's Interactions lists likes, comments, saves and shares as examples Source [1].

Does Instagram give followers-only engagement?

For posts, stories and Instagram Live, Instagram says you can see Accounts engaged broken down into followers and non-followers Source [1].